Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec25d56d3b7f169…

MALICIOUS

PDF

90.4 KB Created: 2021-08-13 22:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: e3e469583fc3fad58181e6404d6625d2 SHA-1: 04bc31c2a635ad3f4663e6eefcc353d6d920501f SHA-256: 3ec25d56d3b7f1695046a935c30272735a4c51fd07274aacbd050aae9c1ee909
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to compromised WordPress upload directories, suggesting a link farm designed to host and distribute malicious files. The presence of embedded JavaScript further indicates potential for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/l9tqevjb43t9koq2t355u8s221/niradofijovalanoreropede.pdf In PDF document text
    • https://atamergranit.com/userfiles/file/53405342338.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/cn4e2nip3rd1e0aals18r7iuii/11858748462.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/75178077117.pdfIn PDF document text
    • http://ndt-ultratech.com/files/39205196328.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f536ca3b272---xexobulubopel.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/b20c0fcd7fa485818f1eabe6a99852d7/72505457577.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106181653578348097d38y8.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///64195180099.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96eba7a2b9---peperatebowalatufa.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/95158850727.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/404422ac2fd606c573ec10a883a04ca1/fivufa.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/jibezapunenurapanifadupu.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079426b7e2ea---guropibenu.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/riduluti.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/64293077866.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/6mb93sb2sr37hvrr5m8d41mgrh/devovidepatelinofifu.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/mekanopobefakoda.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6482326ba6---196520027.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/lakugovotexavapufu.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/e2870f263d2eafa518d04f0cf65a3e4c/lujakadekodadometavixi.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/gepomowegebukuritumafat.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/4817689358.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/83a9ea142c010a50fffa8bd0155a3f33/xifuwapefivigonoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=cooking+instructions+for+masterbuilt+electric+smokerPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFC 11040 bytes
SHA-256: 57f41321ae67ff069c87cc9f6c7d33583b7d191fc69e4f46c3e9a16bb2800146
font_01_sfnt_off000115bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BF 16376 bytes
SHA-256: 77be489914059e0d0b6a42729ba05850a3c12787c472f66cbf0a248b14621e6b
font_02_sfnt_off00013ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1